2005 buick ron… keeps over heating new water pump. I have no thermostat new hoses new battery fan seems to come on goes on red after driving 20 min want get to more than half way Mark if I’m not seating. I just don’t no what else to do
First off, put the thermostat back in. It hurts, not helps.
Have the coolant system pressure tested. Might be a blown head gasket. Now that is a wild guess since you didn’t post what engine this has nor how many miles on it.